Ejemplo n.º 1
0
    def test_construct(self):

        # 2 bytes ASN
        as_path = ASPath.construct(asn4=False, value=[(2, [3257, 31027, 34848, 21465])])
        self.assertEqual(as_path, b'@\x02\n\x02\x04\x0c\xb9y3\x88 S\xd9')

        # 4 bytes ASN
        as_path = ASPath.construct(asn4=True, value=[(2, [3257, 31027, 34848, 21465])])
        self.assertEqual(as_path, b'@\x02\x12\x02\x04\x00\x00\x0c\xb9\x00\x00y3\x00\x00\x88 \x00\x00S\xd9')
Ejemplo n.º 2
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    def test_construct(self):

        # 2 bytes ASN
        as_path = ASPath.construct(asn4=False,
                                   value=[(2, [3257, 31027, 34848, 21465])])
        self.assertEqual(as_path, b'@\x02\n\x02\x04\x0c\xb9y3\x88 S\xd9')

        # 4 bytes ASN
        as_path = ASPath.construct(asn4=True,
                                   value=[(2, [3257, 31027, 34848, 21465])])
        self.assertEqual(
            as_path,
            b'@\x02\x12\x02\x04\x00\x00\x0c\xb9\x00\x00y3\x00\x00\x88 \x00\x00S\xd9'
        )
Ejemplo n.º 3
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 def test_construct_as_set_as_federate(self):
     as_path = ASPath.construct(asn4=False,
                                value=[(4, [1001, 1002]), (3, [1003,
                                                               1004])])
     self.assertEqual(
         as_path,
         b'@\x02\x0c\x04\x02\x03\xe9\x03\xea\x03\x02\x03\xeb\x03\xec')
Ejemplo n.º 4
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    def test_parse(self):

        as_path = ASPath.parse(value=b'')
        self.assertEqual(as_path, [])

        # 2bytes ASN
        as_path = ASPath.parse(value=b'\x02\x04\x0c\xb9y3\x88 S\xd9')
        self.assertEqual(as_path, [(2, [3257, 31027, 34848, 21465])])

        # 4bytes ASN
        as_path = ASPath.parse(
            value=
            b'\x02\x04\x00\x00\x0c\xb9\x00\x00y3\x00\x00\x88 \x00\x00S\xd9',
            asn4=True)
        self.assertEqual(as_path, [(2, [3257, 31027, 34848, 21465])])

        # MALFORMED_ASPATH
        try:
            ASPath.parse(
                value=
                b'\x02\x04\x00\x00\x0c\xb9\x00\x00y3\x00\x00\x88 \x00\x00S\xd9'
            )
        except UpdateMessageError as e:
            self.assertEqual(e.sub_error, ERR_MSG_UPDATE_MALFORMED_ASPATH)
        try:
            ASPath.parse(value=b'\x05\x04\x0c\xb9y3\x88 S\xd9')
        except UpdateMessageError as e:
            self.assertEqual(e.sub_error, ERR_MSG_UPDATE_MALFORMED_ASPATH)
Ejemplo n.º 5
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    def construct_attributes(attr_dict, asn4=False):

        """
        construts BGP Update attirubte.

        :param attr_dict: bgp attribute dictionary
        :param asn4: support 4 bytes asn or not
        """
        attr_raw_hex = b''
        for type_code, value in attr_dict.items():

            if type_code == bgp_cons.BGPTYPE_ORIGIN:
                origin_hex = Origin.construct(value=value)
                attr_raw_hex += origin_hex

            elif type_code == bgp_cons.BGPTYPE_AS_PATH:
                aspath_hex = ASPath.construct(value=value, asn4=asn4)
                attr_raw_hex += aspath_hex

            elif type_code == bgp_cons.BGPTYPE_NEXT_HOP:
                nexthop_hex = NextHop.construct(value=value)
                attr_raw_hex += nexthop_hex

            elif type_code == bgp_cons.BGPTYPE_MULTI_EXIT_DISC:
                med_hex = MED.construct(value=value)
                attr_raw_hex += med_hex

            elif type_code == bgp_cons.BGPTYPE_LOCAL_PREF:
                localpre_hex = LocalPreference.construct(value=value)
                attr_raw_hex += localpre_hex

            elif type_code == bgp_cons.BGPTYPE_ATOMIC_AGGREGATE:
                atomicaggregate_hex = AtomicAggregate.construct(value=value)
                attr_raw_hex += atomicaggregate_hex

            elif type_code == bgp_cons.BGPTYPE_AGGREGATOR:
                aggregator_hex = Aggregator.construct(value=value, asn4=asn4)
                attr_raw_hex += aggregator_hex

            elif type_code == bgp_cons.BGPTYPE_COMMUNITIES:
                community_hex = Community.construct(value=value)
                attr_raw_hex += community_hex

            elif type_code == bgp_cons.BGPTYPE_ORIGINATOR_ID:
                originatorid_hex = OriginatorID.construct(value=value)
                attr_raw_hex += originatorid_hex

            elif type_code == bgp_cons.BGPTYPE_CLUSTER_LIST:
                clusterlist_hex = ClusterList.construct(value=value)
                attr_raw_hex += clusterlist_hex

        return attr_raw_hex
Ejemplo n.º 6
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    def construct_attributes(attr_dict, asn4=False):
        """
        construts BGP Update attirubte.

        :param attr_dict: bgp attribute dictionary
        :param asn4: support 4 bytes asn or not
        """
        attr_raw_hex = b''
        for type_code, value in attr_dict.items():

            if type_code == bgp_cons.BGPTYPE_ORIGIN:
                origin_hex = Origin.construct(value=value)
                attr_raw_hex += origin_hex

            elif type_code == bgp_cons.BGPTYPE_AS_PATH:
                aspath_hex = ASPath.construct(value=value, asn4=asn4)
                attr_raw_hex += aspath_hex

            elif type_code == bgp_cons.BGPTYPE_NEXT_HOP:
                nexthop_hex = NextHop.construct(value=value)
                attr_raw_hex += nexthop_hex

            elif type_code == bgp_cons.BGPTYPE_MULTI_EXIT_DISC:
                med_hex = MED.construct(value=value)
                attr_raw_hex += med_hex

            elif type_code == bgp_cons.BGPTYPE_LOCAL_PREF:
                localpre_hex = LocalPreference.construct(value=value)
                attr_raw_hex += localpre_hex

            elif type_code == bgp_cons.BGPTYPE_ATOMIC_AGGREGATE:
                atomicaggregate_hex = AtomicAggregate.construct(value=value)
                attr_raw_hex += atomicaggregate_hex

            elif type_code == bgp_cons.BGPTYPE_AGGREGATOR:
                aggregator_hex = Aggregator.construct(value=value, asn4=asn4)
                attr_raw_hex += aggregator_hex

            elif type_code == bgp_cons.BGPTYPE_COMMUNITIES:
                community_hex = Community.construct(value=value)
                attr_raw_hex += community_hex

            elif type_code == bgp_cons.BGPTYPE_ORIGINATOR_ID:
                originatorid_hex = OriginatorID.construct(value=value)
                attr_raw_hex += originatorid_hex

            elif type_code == bgp_cons.BGPTYPE_CLUSTER_LIST:
                clusterlist_hex = ClusterList.construct(value=value)
                attr_raw_hex += clusterlist_hex

        return attr_raw_hex
Ejemplo n.º 7
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    def test_parse(self):

        as_path = ASPath.parse(value=b'')
        self.assertEqual(as_path, [])

        # 2bytes ASN
        as_path = ASPath.parse(value=b'\x02\x04\x0c\xb9y3\x88 S\xd9')
        self.assertEqual(as_path, [(2, [3257, 31027, 34848, 21465])])

        # 4bytes ASN
        as_path = ASPath.parse(value=b'\x02\x04\x00\x00\x0c\xb9\x00\x00y3\x00\x00\x88 \x00\x00S\xd9',
                               asn4=True)
        self.assertEqual(as_path, [(2, [3257, 31027, 34848, 21465])])

        # MALFORMED_ASPATH
        try:
            ASPath.parse(value=b'\x02\x04\x00\x00\x0c\xb9\x00\x00y3\x00\x00\x88 \x00\x00S\xd9')
        except UpdateMessageError as e:
            self.assertEqual(e.sub_error, ERR_MSG_UPDATE_MALFORMED_ASPATH)
        try:
            ASPath.parse(value=b'\x05\x04\x0c\xb9y3\x88 S\xd9')
        except UpdateMessageError as e:
            self.assertEqual(e.sub_error, ERR_MSG_UPDATE_MALFORMED_ASPATH)
Ejemplo n.º 8
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 def test_parse_as_set_as_federate(self):
     as_path = ASPath.parse(
         value=b'\x04\x02\x03\xe9\x03\xea\x03\x02\x03\xeb\x03\xec')
     self.assertEqual(as_path, [(4, [1001, 1002]), (3, [1003, 1004])])
Ejemplo n.º 9
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    def parse_attributes(data, asn4=False):
        """
        Parses an RFC4271 encoded blob of BGP attributes into a list

        :param data:
        :param asn4: support 4 bytes asn or not
        :return:
        """
        attributes = {}
        postfix = data
        while len(postfix) > 0:

            try:
                flags, type_code = struct.unpack('!BB', postfix[:2])

                if flags & AttributeFlag.EXTENDED_LENGTH:
                    attr_len = struct.unpack('!H', postfix[2:4])[0]
                    attr_value = postfix[4:4 + attr_len]
                    postfix = postfix[4 + attr_len:]  # Next attribute
                else:  # standard 1-octet length
                    if isinstance(postfix[2], int):
                        attr_len = postfix[2]
                    else:
                        attr_len = ord(postfix[2])
                    attr_value = postfix[3:3 + attr_len]
                    postfix = postfix[3 + attr_len:]  # Next attribute
            except Exception as e:
                LOG.error(e)
                error_str = traceback.format_exc()
                LOG.debug(error_str)
                raise excep.UpdateMessageError(
                    sub_error=bgp_cons.ERR_MSG_UPDATE_MALFORMED_ATTR_LIST,
                    data='')

            if type_code == bgp_cons.BGPTYPE_ORIGIN:

                decode_value = Origin.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_AS_PATH:

                decode_value = ASPath.parse(value=attr_value, asn4=asn4)

            elif type_code == bgp_cons.BGPTYPE_NEXT_HOP:

                decode_value = NextHop.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_MULTI_EXIT_DISC:

                decode_value = MED.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_LOCAL_PREF:

                decode_value = LocalPreference.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_ATOMIC_AGGREGATE:

                decode_value = AtomicAggregate.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_AGGREGATOR:

                decode_value = Aggregator.parse(value=attr_value, asn4=asn4)

            elif type_code == bgp_cons.BGPTYPE_COMMUNITIES:

                decode_value = Community.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_ORIGINATOR_ID:

                decode_value = OriginatorID.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_CLUSTER_LIST:

                decode_value = ClusterList.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_LINK_STATE:
                decode_value = LinkState.parse(value=attr_value).dict()[29]

            elif type_code == bgp_cons.BGPTYPE_NEW_AS_PATH:

                decode_value = ASPath.parse(value=attr_value, asn4=True)

            elif type_code == bgp_cons.BGPTYPE_NEW_AGGREGATOR:

                decode_value = Aggregator.parse(value=attr_value, asn4=True)

            elif type_code == bgp_cons.BGPTYPE_MP_REACH_NLRI:
                decode_value = MpReachNLRI.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_MP_UNREACH_NLRI:
                decode_value = MpUnReachNLRI.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_EXTENDED_COMMUNITY:
                decode_value = ExtCommunity.parse(value=attr_value)
            elif type_code == bgp_cons.BGPTYPE_PMSI_TUNNEL:
                decode_value = PMSITunnel.parse(value=attr_value)
            else:
                decode_value = binascii.b2a_hex(attr_value)
            attributes[type_code] = decode_value

        return attributes
Ejemplo n.º 10
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    def parse_attributes(data, asn4=False):
        """
        Parses an RFC4271 encoded blob of BGP attributes into a list

        :param data:
        :param asn4: support 4 bytes asn or not
        :return:
        """
        attributes = {}
        postfix = data
        while len(postfix) > 0:

            try:
                flags, type_code = struct.unpack('!BB', postfix[:2])

                if flags & AttributeFlag.EXTENDED_LENGTH:
                    attr_len = struct.unpack('!H', postfix[2:4])[0]
                    attr_value = postfix[4:4 + attr_len]
                    postfix = postfix[4 + attr_len:]    # Next attribute
                else:    # standard 1-octet length
                    if isinstance(postfix[2], int):
                        attr_len = postfix[2]
                    else:
                        attr_len = ord(postfix[2])
                    attr_value = postfix[3:3 + attr_len]
                    postfix = postfix[3 + attr_len:]    # Next attribute
            except Exception as e:
                LOG.error(e)
                error_str = traceback.format_exc()
                LOG.debug(error_str)
                raise excep.UpdateMessageError(
                    sub_error=bgp_cons.ERR_MSG_UPDATE_MALFORMED_ATTR_LIST,
                    data='')

            if type_code == bgp_cons.BGPTYPE_ORIGIN:

                decode_value = Origin.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_AS_PATH:

                decode_value = ASPath.parse(value=attr_value, asn4=asn4)

            elif type_code == bgp_cons.BGPTYPE_NEXT_HOP:

                decode_value = NextHop.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_MULTI_EXIT_DISC:

                decode_value = MED.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_LOCAL_PREF:

                decode_value = LocalPreference.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_ATOMIC_AGGREGATE:

                decode_value = AtomicAggregate.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_AGGREGATOR:

                decode_value = Aggregator.parse(value=attr_value, asn4=asn4)

            elif type_code == bgp_cons.BGPTYPE_COMMUNITIES:

                decode_value = Community.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_ORIGINATOR_ID:

                decode_value = OriginatorID.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_CLUSTER_LIST:

                decode_value = ClusterList.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_NEW_AS_PATH:

                decode_value = ASPath.parse(value=attr_value, asn4=True)

            elif type_code == bgp_cons.BGPTYPE_NEW_AGGREGATOR:

                decode_value = Aggregator.parse(value=attr_value, asn4=True)

            elif type_code == bgp_cons.BGPTYPE_MP_REACH_NLRI:
                decode_value = MpReachNLRI.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_MP_UNREACH_NLRI:
                decode_value = MpUnReachNLRI.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_EXTENDED_COMMUNITY:
                decode_value = ExtCommunity.parse(value=attr_value)
            elif type_code == bgp_cons.BGPTYPE_PMSI_TUNNEL:
                decode_value = PMSITunnel.parse(value=attr_value)
            else:
                decode_value = repr(attr_value)
            attributes[type_code] = decode_value

        return attributes
Ejemplo n.º 11
0
    def construct_attributes(attr_dict, asn4=False):
        """
        construts BGP Update attirubte.

        :param attr_dict: bgp attribute dictionary
        :param asn4: support 4 bytes asn or not
        """
        attr_raw_hex = b''
        for type_code, value in attr_dict.items():
            if type_code == bgp_cons.BGPTYPE_ORIGIN:
                origin_hex = Origin.construct(value=value)
                attr_raw_hex += origin_hex

            elif type_code == bgp_cons.BGPTYPE_AS_PATH:
                aspath_hex = ASPath.construct(value=value, asn4=asn4)
                attr_raw_hex += aspath_hex

            elif type_code == bgp_cons.BGPTYPE_NEXT_HOP:
                nexthop_hex = NextHop.construct(value=value)
                attr_raw_hex += nexthop_hex

            elif type_code == bgp_cons.BGPTYPE_MULTI_EXIT_DISC:
                med_hex = MED.construct(value=value)
                attr_raw_hex += med_hex

            elif type_code == bgp_cons.BGPTYPE_LOCAL_PREF:
                localpre_hex = LocalPreference.construct(value=value)
                attr_raw_hex += localpre_hex

            elif type_code == bgp_cons.BGPTYPE_ATOMIC_AGGREGATE:
                atomicaggregate_hex = AtomicAggregate.construct(value=value)
                attr_raw_hex += atomicaggregate_hex

            elif type_code == bgp_cons.BGPTYPE_AGGREGATOR:
                aggregator_hex = Aggregator.construct(value=value, asn4=asn4)
                attr_raw_hex += aggregator_hex

            elif type_code == bgp_cons.BGPTYPE_COMMUNITIES:
                community_hex = Community.construct(value=value)
                attr_raw_hex += community_hex

            elif type_code == bgp_cons.BGPTYPE_ORIGINATOR_ID:
                originatorid_hex = OriginatorID.construct(value=value)
                attr_raw_hex += originatorid_hex

            elif type_code == bgp_cons.BGPTYPE_CLUSTER_LIST:
                clusterlist_hex = ClusterList.construct(value=value)
                attr_raw_hex += clusterlist_hex

            elif type_code == bgp_cons.BGPTYPE_MP_REACH_NLRI:
                mpreach_hex = MpReachNLRI().construct(value=value)
                attr_raw_hex += mpreach_hex
            elif type_code == bgp_cons.BGPTYPE_MP_UNREACH_NLRI:
                mpunreach_hex = MpUnReachNLRI.construct(value=value)
                attr_raw_hex += mpunreach_hex
            elif type_code == bgp_cons.BGPTYPE_EXTENDED_COMMUNITY:
                community_ext_hex = ExtCommunity.construct(value=value)
                attr_raw_hex += community_ext_hex
            elif type_code == bgp_cons.BGPTYPE_PMSI_TUNNEL:
                evpn_overlay = EVPN.signal_evpn_overlay(attr_dict)
                attr_raw_hex += PMSITunnel.construct(value=value,
                                                     evpn_overlay=evpn_overlay)
            elif type_code == bgp_cons.BGPTYPE_TUNNEL_ENCAPS_ATTR:
                tunnelencap_hex = TunnelEncaps.construct(value=value)
                attr_raw_hex += tunnelencap_hex
            elif type_code == bgp_cons.BGPTYPE_LARGE_COMMUNITY:
                large_community_ext_hex = LargeCommunity.construct(value=value)
                attr_raw_hex += large_community_ext_hex

        return attr_raw_hex
Ejemplo n.º 12
0
    def parse_attributes(data, asn4=False):
        """
        Parses an RFC4271 encoded blob of BGP attributes into a list

        :param data:
        :param asn4: support 4 bytes asn or not
        :return:
        """
        attributes = {}
        postfix = data
        bgpls_pro_id = None
        bgpls_attr = None
        while len(postfix) > 0:

            try:
                flags, type_code = struct.unpack('!BB', postfix[:2])

                if flags & AttributeFlag.EXTENDED_LENGTH:
                    attr_len = struct.unpack('!H', postfix[2:4])[0]
                    attr_value = postfix[4:4 + attr_len]
                    postfix = postfix[4 + attr_len:]  # Next attribute
                else:  # standard 1-octet length
                    if isinstance(postfix[2], int):
                        attr_len = postfix[2]
                    else:
                        attr_len = ord(postfix[2])
                    attr_value = postfix[3:3 + attr_len]
                    postfix = postfix[3 + attr_len:]  # Next attribute
            except Exception as e:
                LOG.error(e)
                error_str = traceback.format_exc()
                LOG.debug(error_str)
                raise excep.UpdateMessageError(
                    sub_error=bgp_cons.ERR_MSG_UPDATE_MALFORMED_ATTR_LIST,
                    data='')

            if type_code == bgp_cons.BGPTYPE_ORIGIN:

                decode_value = Origin.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_AS_PATH:

                decode_value = ASPath.parse(value=attr_value, asn4=asn4)

            elif type_code == bgp_cons.BGPTYPE_NEXT_HOP:

                decode_value = NextHop.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_MULTI_EXIT_DISC:

                decode_value = MED.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_LOCAL_PREF:

                decode_value = LocalPreference.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_ATOMIC_AGGREGATE:

                decode_value = AtomicAggregate.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_AGGREGATOR:

                decode_value = Aggregator.parse(value=attr_value, asn4=asn4)

            elif type_code == bgp_cons.BGPTYPE_COMMUNITIES:

                decode_value = Community.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_ORIGINATOR_ID:

                decode_value = OriginatorID.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_CLUSTER_LIST:

                decode_value = ClusterList.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_NEW_AS_PATH:

                decode_value = ASPath.parse(value=attr_value, asn4=True)

            elif type_code == bgp_cons.BGPTYPE_NEW_AGGREGATOR:

                decode_value = Aggregator.parse(value=attr_value, asn4=True)

            elif type_code == bgp_cons.BGPTYPE_LARGE_COMMUNITY:

                decode_value = LargeCommunity.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_MP_REACH_NLRI:
                decode_value = MpReachNLRI.parse(value=attr_value)
                if decode_value['nlri'][0] and type(
                        decode_value['nlri'][0]) is dict:
                    if decode_value['nlri'][0].get("protocol_id"):
                        bgpls_pro_id = decode_value['nlri'][0]["protocol_id"]

            elif type_code == bgp_cons.BGPTYPE_MP_UNREACH_NLRI:
                decode_value = MpUnReachNLRI.parse(value=attr_value)

            elif type_code == bgp_cons.BGPTYPE_EXTENDED_COMMUNITY:
                decode_value = ExtCommunity.parse(value=attr_value)
            elif type_code == bgp_cons.BGPTYPE_PMSI_TUNNEL:
                decode_value = PMSITunnel.parse(value=attr_value)
                pmsi_hex = attr_value
            elif type_code == bgp_cons.BGPTYPE_LINK_STATE:
                if bgpls_pro_id:
                    attributes.update(
                        LinkState.unpack(bgpls_pro_id=bgpls_pro_id,
                                         data=attr_value).dict())
                else:
                    bgpls_attr = attr_value
                continue
            else:
                decode_value = binascii.b2a_hex(attr_value)
            attributes[type_code] = decode_value
        if bgpls_attr:
            attributes.update(
                LinkState.unpack(bgpls_pro_id=bgpls_pro_id,
                                 data=attr_value).dict())
        evpn_overlay = EVPN.signal_evpn_overlay(attributes)
        if evpn_overlay['evpn'] and evpn_overlay['encap_ec']:
            if bgp_cons.BGPTYPE_PMSI_TUNNEL in attributes:
                attributes[bgp_cons.BGPTYPE_PMSI_TUNNEL] = PMSITunnel.parse(
                    value=pmsi_hex, evpn_overlay=evpn_overlay)
        return attributes
Ejemplo n.º 13
0
 def test_construct_as_set_as_federate(self):
     as_path = ASPath.construct(asn4=False, value=[(4, [1001, 1002]), (3, [1003, 1004])])
     self.assertEqual(as_path, b'@\x02\x0c\x04\x02\x03\xe9\x03\xea\x03\x02\x03\xeb\x03\xec')
Ejemplo n.º 14
0
 def test_parse_as_set_as_federate(self):
     as_path = ASPath.parse(value=b'\x04\x02\x03\xe9\x03\xea\x03\x02\x03\xeb\x03\xec')
     self.assertEqual(as_path, [(4, [1001, 1002]), (3, [1003, 1004])])